2ft3
From Proteopedia
(New page: 200px<br /><applet load="2ft3" size="450" color="white" frame="true" align="right" spinBox="true" caption="2ft3, resolution 3.400Å" /> '''Crystal structure o...) |
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| - | [[Image:2ft3.gif|left|200px]]<br /><applet load="2ft3" size=" | + | [[Image:2ft3.gif|left|200px]]<br /><applet load="2ft3" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="2ft3, resolution 3.400Å" /> | caption="2ft3, resolution 3.400Å" /> | ||
'''Crystal structure of the biglycan dimer core protein'''<br /> | '''Crystal structure of the biglycan dimer core protein'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Biglycan and decorin are two closely related proteoglycans whose protein | + | Biglycan and decorin are two closely related proteoglycans whose protein cores contain leucine-rich repeats flanked by disulfides. We have previously shown that decorin is dimeric both in solution and in crystal structures. In this study we determined whether biglycan dimerizes and investigated the role of dimerization in the folding and stability of these proteoglycans. We used light scattering to show that biglycan is dimeric in solution and solved the crystal structure of the glycoprotein core of biglycan at 3.40-angstroms resolution. This structure reveals that biglycan dimerizes in the same way as decorin, i.e. by apposition of the concave inner surfaces of the leucine-rich repeat domains. We demonstrate that low concentrations of guanidinium chloride denature biglycan and decorin but that the denaturation is completely reversible following removal of the guanidinium chloride, as assessed by circular dichroism spectroscopy. Furthermore, the rate of refolding is dependent on protein concentration, demonstrating that it is not a unimolecular process. Upon heating, decorin shows a single structural transition at a T(m) of 45-46 degrees C but refolds completely upon cooling to 25 degrees C. This property of decorin enabled us to show both by calorimetry and light scattering that dimer to monomer transition coincided with unfolding and monomer to dimer transition coincided with refolding; thus these processes are inextricably linked. We further conclude that folded monomeric biglycan or decorin cannot exist in solution. This implies novel interrelated functions for the parallel beta sheet faces of these leucine-rich repeat proteoglycans, including dimerization and stabilization of protein folding. |
==About this Structure== | ==About this Structure== | ||
| - | 2FT3 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with NAG and FLC as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | + | 2FT3 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with <scene name='pdbligand=NAG:'>NAG</scene> and <scene name='pdbligand=FLC:'>FLC</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FT3 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Bos taurus]] | [[Category: Bos taurus]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Bergmann, E | + | [[Category: Bergmann, E M.]] |
| - | [[Category: Dodd, C | + | [[Category: Dodd, C M.]] |
| - | [[Category: Scott, P | + | [[Category: Scott, P G.]] |
[[Category: FLC]] | [[Category: FLC]] | ||
[[Category: NAG]] | [[Category: NAG]] | ||
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[[Category: proteoglycan]] | [[Category: proteoglycan]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:24:51 2008'' |
Revision as of 15:24, 21 February 2008
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Crystal structure of the biglycan dimer core protein
Overview
Biglycan and decorin are two closely related proteoglycans whose protein cores contain leucine-rich repeats flanked by disulfides. We have previously shown that decorin is dimeric both in solution and in crystal structures. In this study we determined whether biglycan dimerizes and investigated the role of dimerization in the folding and stability of these proteoglycans. We used light scattering to show that biglycan is dimeric in solution and solved the crystal structure of the glycoprotein core of biglycan at 3.40-angstroms resolution. This structure reveals that biglycan dimerizes in the same way as decorin, i.e. by apposition of the concave inner surfaces of the leucine-rich repeat domains. We demonstrate that low concentrations of guanidinium chloride denature biglycan and decorin but that the denaturation is completely reversible following removal of the guanidinium chloride, as assessed by circular dichroism spectroscopy. Furthermore, the rate of refolding is dependent on protein concentration, demonstrating that it is not a unimolecular process. Upon heating, decorin shows a single structural transition at a T(m) of 45-46 degrees C but refolds completely upon cooling to 25 degrees C. This property of decorin enabled us to show both by calorimetry and light scattering that dimer to monomer transition coincided with unfolding and monomer to dimer transition coincided with refolding; thus these processes are inextricably linked. We further conclude that folded monomeric biglycan or decorin cannot exist in solution. This implies novel interrelated functions for the parallel beta sheet faces of these leucine-rich repeat proteoglycans, including dimerization and stabilization of protein folding.
About this Structure
2FT3 is a Single protein structure of sequence from Bos taurus with and as ligands. Full crystallographic information is available from OCA.
Reference
Crystal structure of the biglycan dimer and evidence that dimerization is essential for folding and stability of class I small leucine-rich repeat proteoglycans., Scott PG, Dodd CM, Bergmann EM, Sheehan JK, Bishop PN, J Biol Chem. 2006 May 12;281(19):13324-32. Epub 2006 Mar 17. PMID:16547006
Page seeded by OCA on Thu Feb 21 17:24:51 2008
Categories: Bos taurus | Single protein | Bergmann, E M. | Dodd, C M. | Scott, P G. | FLC | NAG | Dimer interface | Proteoglycan
